best fertilizer for blackberry plants Berry Blend Fertilizer 5 PoundOur Berry Fertilizer 8 12 12 is a premium blended fertilizer formulated specifically for berry plants. With an ideal nutrient ratio for strong root development and heavy fruit production, this mix ensures your berry plants get exactly what they need at the right time. The 8% nitrogen fuels early season growth, helping plants establish lush, sturdy foliage. The 12% phosphorus supports vigorous root expansion and boosts bloom and fruit set a must for

Our Berry Fertilizer 8-12-12 is a premium blended fertilizer formulated specifically for berry plants. With an ideal nutrient ratio for strong root development and heavy fruit production, this mix ensures your berry plants get exactly what they need at the right time.

The 8% nitrogen fuels early season growth, helping plants establish lush, sturdy foliage. The 12% phosphorus supports vigorous root expansion and boosts bloom and fruit set — a must for blackberries, raspberries, and strawberries. With 12% potassium, this blend strengthens plant structure, improves drought tolerance, and enhances overall fruit quality.

This formula contains a targeted blend of muriate of potash, potassium sulfate, and potassium nitrate to give berry plants an immediately available and long-lasting source of potash. It also includes a robust micronutrient package with calcium, magnesium, sulfur, iron, manganese, zinc, and copper, strengthening plant health and preventing common deficiencies that limit berry yield and flavor.

This fertilizer is easy to apply and provides predictable, dependable nutrition for berry growers of all experience levels. Whether you're growing in rows, raised beds, or a backyard berry patch, this 8-12-12 blend delivers powerful results.

GUARANTEED ANALYSIS 

• Total Nitrogen (N) – 8%

  • Nitrate Nitrogen – 0.65%

  • Ammoniacal Nitrogen – 4.95%

  • Urea Nitrogen – 0.30%

  • Slowly Available Water-Soluble Nitrogen – 1.00%

  • Water Insoluble Nitrogen – 1.20%

• Available Phosphate (P₂O₅) – 12%

• Soluble Potash (K₂O) – 12%
  Derived From:
  • 6% Muriate of Potash
  • 4% Potassium Sulfate
  • 2% Potassium Nitrate

• Calcium – 2.42%

• Magnesium – 0.15%

• Sulfur – 5.09%

• Copper – 0.03%

• Iron – 1.35%

• Manganese – 0.13%

• Zinc – 0.05%

Ingredients: Ammonium sulfate, biochar, cottonseed, gypsum, humates, iron sulfate, monoammonium phosphate, molasses, methylene urea, mycorrhizal fungi, potassium nitrate, potassium sulfate, trace elements.

Berry Fertilizer Use Recommendations

For best results, apply the fertilizer uniformly around each plant. Adjust the rate based on plant size and age:

Application Rates

• LOW Rate: Use for newly planted berries and small plugs.
  Low = ½ teaspoon per plant

• MEDIUM Rate: Use for plants that have been established 1–2 years.
  Medium = 1 tablespoon per plant

• HIGH Rate: Use for large, well-established plants.
  High = 4 tablespoons per plant

How to Apply

• Sprinkle the recommended amount evenly around the base of each plant.

• Lightly work the fertilizer into the top 1–2 inches of soil.

• Water thoroughly after application to activate nutrients.

Seasonal Timing

• At Planting: Use LOW rates for young plants or plugs being transplanted.

• Early Season: Apply MEDIUM rates once plants begin active growth.

• During Fruiting: Apply HIGH rates to support fruit load, size, and flavor.

• Repeat: Every 4–6 weeks throughout the growing season as needed.

Container Berry Plants

• Apply ½ tablespoon per gallon of container size (e.g., 2–3 tbsp for a 5-gallon pot).

• Mix into the soil surface and water well.